lib/libc/posix1e/acl_to_text.c

   1 /*-
   2  * Copyright (c) 1999-2002 Robert N. M. Watson
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  */
  26 /*
  27  * acl_to_text - return a text string with a text representation of the acl
  28  * in it.
  29  */
  30
  31 #include <sys/cdefs.h>
  32 __FBSDID("$FreeBSD$");
  33
  34 #include <sys/types.h>
  35 #include "namespace.h"
  36 #include <sys/acl.h>
  37 #include "un-namespace.h"
  38 #include <sys/errno.h>
  39 #include <stdio.h>
  40 #include <stdlib.h>
  41 #include <string.h>
  42
  43 #include "acl_support.h"
  44
  45 /*
  46  * acl_to_text - generate a text form of an acl
  47  * spec says nothing about output ordering, so leave in acl order
  48  *
  49  * This function will not produce nice results if it is called with
  50  * a non-POSIX.1e semantics ACL.
  51  */
  52
  53 char *_nfs4_acl_to_text_np(const acl_t acl, ssize_t *len_p, int flags);
  54
  55 static char *
  56 _posix1e_acl_to_text(acl_t acl, ssize_t *len_p, int flags)
  57 {
  58         struct acl      *acl_int;
  59         char            *buf, *tmpbuf;
  60         char             name_buf[MAXLOGNAME];
  61         char             perm_buf[_POSIX1E_ACL_STRING_PERM_MAXSIZE+1],
  62                          effective_perm_buf[_POSIX1E_ACL_STRING_PERM_MAXSIZE+1];
  63         int              i, error, len;
  64         uid_t            ae_id;
  65         acl_tag_t        ae_tag;
  66         acl_perm_t       ae_perm, effective_perm, mask_perm;
  67
  68         buf = strdup("");
  69         if (buf == NULL)
  70                 return(NULL);
  71
  72         acl_int = &acl->ats_acl;
  73
  74         mask_perm = ACL_PERM_BITS;      /* effective is regular if no mask */
  75         for (i = 0; i < acl_int->acl_cnt; i++)
  76                 if (acl_int->acl_entry[i].ae_tag == ACL_MASK)
  77                         mask_perm = acl_int->acl_entry[i].ae_perm;
  78
  79         for (i = 0; i < acl_int->acl_cnt; i++) {
  80                 ae_tag = acl_int->acl_entry[i].ae_tag;
  81                 ae_id = acl_int->acl_entry[i].ae_id;
  82                 ae_perm = acl_int->acl_entry[i].ae_perm;
  83
  84                 switch(ae_tag) {
  85                 case ACL_USER_OBJ:
  86                         error = _posix1e_acl_perm_to_string(ae_perm,
  87                             _POSIX1E_ACL_STRING_PERM_MAXSIZE+1, perm_buf);
  88                         if (error)
  89                                 goto error_label;
  90                         len = asprintf(&tmpbuf, "%suser::%s\n", buf,
  91                             perm_buf);
  92                         if (len == -1)
  93                                 goto error_label;
  94                         free(buf);
  95                         buf = tmpbuf;
  96                         break;
  97
  98                 case ACL_USER:
  99                         error = _posix1e_acl_perm_to_string(ae_perm,
 100                             _POSIX1E_ACL_STRING_PERM_MAXSIZE+1, perm_buf);
 101                         if (error)
 102                                 goto error_label;
 103
 104                         error = _posix1e_acl_id_to_name(ae_tag, ae_id,
 105                             MAXLOGNAME, name_buf, flags);
 106                         if (error)
 107                                 goto error_label;
 108
 109                         effective_perm = ae_perm & mask_perm;
 110                         if (effective_perm != ae_perm) {
 111                                 error = _posix1e_acl_perm_to_string(
 112                                     effective_perm,
 113                                     _POSIX1E_ACL_STRING_PERM_MAXSIZE+1,
 114                                     effective_perm_buf);
 115                                 if (error)
 116                                         goto error_label;
 117                                 len = asprintf(&tmpbuf, "%suser:%s:%s\t\t# "
 118                                     "effective: %s\n",
 119                                     buf, name_buf, perm_buf,
 120                                     effective_perm_buf);
 121                         } else {
 122                                 len = asprintf(&tmpbuf, "%suser:%s:%s\n", buf,
 123                                     name_buf, perm_buf);
 124                         }
 125                         if (len == -1)
 126                                 goto error_label;
 127                         free(buf);
 128                         buf = tmpbuf;
 129                         break;
 130
 131                 case ACL_GROUP_OBJ:
 132                         error = _posix1e_acl_perm_to_string(ae_perm,
 133                             _POSIX1E_ACL_STRING_PERM_MAXSIZE+1, perm_buf);
 134                         if (error)
 135                                 goto error_label;
 136
 137                         effective_perm = ae_perm & mask_perm;
 138                         if (effective_perm != ae_perm) {
 139                                 error = _posix1e_acl_perm_to_string(
 140                                     effective_perm,
 141                                     _POSIX1E_ACL_STRING_PERM_MAXSIZE+1,
 142                                     effective_perm_buf);
 143                                 if (error)
 144                                         goto error_label;
 145                                 len = asprintf(&tmpbuf, "%sgroup::%s\t\t# "
 146                                     "effective: %s\n",
 147                                     buf, perm_buf, effective_perm_buf);
 148                         } else {
 149                                 len = asprintf(&tmpbuf, "%sgroup::%s\n", buf,
 150                                     perm_buf);
 151                         }
 152                         if (len == -1)
 153                                 goto error_label;
 154                         free(buf);
 155                         buf = tmpbuf;
 156                         break;
 157
 158                 case ACL_GROUP:
 159                         error = _posix1e_acl_perm_to_string(ae_perm,
 160                             _POSIX1E_ACL_STRING_PERM_MAXSIZE+1, perm_buf);
 161                         if (error)
 162                                 goto error_label;
 163
 164                         error = _posix1e_acl_id_to_name(ae_tag, ae_id,
 165                             MAXLOGNAME, name_buf, flags);
 166                         if (error)
 167                                 goto error_label;
 168
 169                         effective_perm = ae_perm & mask_perm;
 170                         if (effective_perm != ae_perm) {
 171                                 error = _posix1e_acl_perm_to_string(
 172                                     effective_perm,
 173                                     _POSIX1E_ACL_STRING_PERM_MAXSIZE+1,
 174                                     effective_perm_buf);
 175                                 if (error)
 176                                         goto error_label;
 177                                 len = asprintf(&tmpbuf, "%sgroup:%s:%s\t\t# "
 178                                     "effective: %s\n",
 179                                     buf, name_buf, perm_buf,
 180                                     effective_perm_buf);
 181                         } else {
 182                                 len = asprintf(&tmpbuf, "%sgroup:%s:%s\n", buf,
 183                                     name_buf, perm_buf);
 184                         }
 185                         if (len == -1)
 186                                 goto error_label;
 187                         free(buf);
 188                         buf = tmpbuf;
 189                         break;
 190
 191                 case ACL_MASK:
 192                         error = _posix1e_acl_perm_to_string(ae_perm,
 193                             _POSIX1E_ACL_STRING_PERM_MAXSIZE+1, perm_buf);
 194                         if (error)
 195                                 goto error_label;
 196
 197                         len = asprintf(&tmpbuf, "%smask::%s\n", buf,
 198                             perm_buf);
 199                         if (len == -1)
 200                                 goto error_label;
 201                         free(buf);
 202                         buf = tmpbuf;
 203                         break;
 204
 205                 case ACL_OTHER:
 206                         error = _posix1e_acl_perm_to_string(ae_perm,
 207                             _POSIX1E_ACL_STRING_PERM_MAXSIZE+1, perm_buf);
 208                         if (error)
 209                                 goto error_label;
 210
 211                         len = asprintf(&tmpbuf, "%sother::%s\n", buf,
 212                             perm_buf);
 213                         if (len == -1)
 214                                 goto error_label;
 215                         free(buf);
 216                         buf = tmpbuf;
 217                         break;
 218
 219                 default:
 220                         errno = EINVAL;
 221                         goto error_label;
 222                 }
 223         }
 224
 225         if (len_p) {
 226                 *len_p = strlen(buf);
 227         }
 228         return (buf);
 229
 230 error_label:
 231         /* jump to here sets errno already, we just clean up */
 232         if (buf) free(buf);
 233         return (NULL);
 234 }
 235
 236 char *
 237 acl_to_text_np(acl_t acl, ssize_t *len_p, int flags)
 238 {
 239
 240         if (acl == NULL) {
 241                 errno = EINVAL;
 242                 return(NULL);
 243         }
 244
 245         switch (_acl_brand(acl)) {
 246         case ACL_BRAND_POSIX:
 247                 return (_posix1e_acl_to_text(acl, len_p, flags));
 248         case ACL_BRAND_NFS4:
 249                 return (_nfs4_acl_to_text_np(acl, len_p, flags));
 250         default:
 251                 errno = EINVAL;
 252                 return (NULL);
 253         }
 254 }
 255
 256 char *
 257 acl_to_text(acl_t acl, ssize_t *len_p)
 258 {
 259
 260         return (acl_to_text_np(acl, len_p, 0));
 261 }